Blank Page Builder Section

I logged in today to update a page but the avia page builder is gone. It is just a blank page where the content should be. I have tried installing the latest theme 7.1.4 but the problem persists. When I put a backup on a staging site, the builder is there again, but restoring it causes the builder to disappear again.

I can click on the Default button on a page, and then the advanced page builder button appears. However, when I click it, I only see a page with code.